Counties
Blocks can straddle county borders. In this map each block’s “primary county” is the county with the most land area in the block. Atlasers will likely be encouraged to submit new checklists when crossing county lines to maintain county-level data.
Existing surveys
MAPS stations from https://ibp-maps-data-exploration-tool.org/app/maps
Only includes stations through 2018. Also includes inactive stations. Updated data available and can be swapped in (https://www.birdpop.org/pages/mapsMap.php)
BBS routes from https://services2.arcgis.com/Uq9r85Potqm3MfRV/arcgis/rest/services/biosds60_fnu/FeatureServer/0
Blocks with BBS routes: 2421 of 16322( 14.8%)
Blocks with MAPS stations (past and present): 160 of
16322( 1%)
Blocks with BBS routes or MAPS stations: 2543 of 16322(
15.6%)
Project Nestwatch
Project NestWatch offers data on the location and fate of bird nests. In California there are 46171 nesting attempts in the database. This includes records of 215 taxa, which span the period from 1902 to 2024.
Blocks with Nest Watch data: 1402 of 16322 (8.6%)
Road access
Identifying roadless blocks. Roads from TIGER database.
Blocks without roads: 1274 of 16322 (7.8%)
By Sam Safran